1691413 has 2 divisors, whose sum is σ = 1691414. Its totient is φ = 1691412.

The previous prime is 1691411. The next prime is 1691419. The reversal of 1691413 is 3141961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1205604 + 485809 = 1098^2 + 697^2 .

It is a cyclic number.

It is not a de Polignac number, because 1691413 - 2¹ = 1691411 is a prime.

Together with 1691411, it forms a pair of twin primes.

1691413 is a lucky number.

It is equal to p₁₂₇₅₂₈ and since 1691413 and 127528 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1691411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845706 + 845707.

It is an arithmetic number, because the mean of its divisors is an integer number (845707).

2^1691413 is an apocalyptic number.

It is an amenable number.

1691413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691413 is an equidigital number, since it uses as much as digits as its factorization.

1691413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 25.

The square root of 1691413 is about 1300.5433479896. The cubic root of 1691413 is about 119.1470300885.

The spelling of 1691413 in words is "one million, six hundred ninety-one thousand, four hundred thirteen".